The meaning and function of rubber blending

- Jun 17, 2019-

Meaning of rubber blending


Improve process performance, service performance and technical and economic performance.

More than 70% of rubber is processed and used in the form of rubber or rubber and plastic.




Process compatibility of rubber


By mixing thermodynamic incompatible systems mechanically or under other conditions, a sufficiently stable blend can be obtained, which forms a heterogeneous form in the microscopic region but maintains its uniformity in the macroscopic region.



Influencing factors of polymer blending:


Mixing process conditions: time, strength, roll temperature, processing method


Composition: raw rubber, blending ratio, compatibility agent, processing assistant




[use all kinds of rubber]




A combination of natural rubber and butadiene rubber


NR + BR


Ratio: 75 ~ 50/25 ~ 50


Objective: to improve the vulcanization temperature, heat resistance, cold resistance, elasticity and abrasion resistance


Products: conveyor belt, rubber shoes




Natural rubber and styrene-butadiene rubber


NR + SBR


Proportion: arbitrary


Objective: to improve the abrasion resistance of NR and to improve ozone crack resistance of tread grooves


Products: tires and other products




Styrene-butadiene rubber + butadiene rubber


SBR and BR


Proportion: arbitrary


Objective: to improve wear resistance, elasticity and cold resistance


Product: tread




Four, styrene-butadiene rubber + high styrene


SBR+ high styrene


Ratio: 75 ~ 50/25 ~ 50


Objective: to improve abrasion resistance, tear strength and tensile strength

Sole and sponge




Five, styrene-butadiene rubber + high density polyethylene


SBR + HDPE


Ratio: 100/5 ~ 20


Objective: to improve the process performance, reduce the scorch tendency and shrinkage of rubber, and improve the abrasion resistance and ozone resistance of vulcanized rubber


Products: sole and sponge rubber




Ethylene propylene rubber + butyl rubber


EPDM + IIR


50/50 scale:


Objective: to improve tear resistance, heat resistance and ozone resistance.

Improve tread wear resistance


Products: tread, inner tube, etc




Ethylene propylene rubber + chlorinated butyl rubber


EPDM + CIIR


50/50 scale:


Objective: to improve ozone resistance


Product: tire side




Eight, butadiene rubber + ethylene propylene rubber


Butadiene rubber +EPDM


Proportion: arbitrary


Objective: to improve heat resistance, ozone resistance and chemical resistance


Product: tread




NBR + PVC


NBR + PVC


Proportion: arbitrary


Objective: to maintain the oil and heat resistance of NBR.

Improve ozone resistance, wear resistance, flame resistance and dielectric properties


Products: oil resistant rubber, shoes, hose, line cover




NBR+ phenolic resin


Proportion: arbitrary


Objective: to improve the viscosity, hardness, wear resistance and strength of NBR


Products: gasket, lining




Nitrile butadiene rubber + natural rubber or styrene-butadiene rubber


NBR + NR and SBR


Ratio: NR or SBR≤40%


Objective: to improve the cold resistance and reduce the cost of NBR, but other NBR properties are slightly reduced


Products: oil resistant soles, leather bowls




12. Nitrile butadiene rubber and neoprene


NBR + CR


Proportion: arbitrary


Objective: to improve weather resistance and ozone resistance


Products: outdoor oil resistant products




NBR + epdm


NBR + EPDM


Objective: to improve weather resistance and ozone resistance




14. Neoprene + natural rubber


CR + NR


80/20 scale:


Objective: to improve the process performance of CR


Products: conveyor belt or cover glue




15. Neoprene + nitrile butadiene rubber


CR + NBR


Proportion: arbitrary


Objective: to improve the roll sticking, pressing, calendering and oil resistance of CR




16. Neoprene + butadiene rubber


CR + BR


Ratio: 90 ~ 60/10 ~ 40


Objective: to improve the cold resistance, wear resistance and elasticity of CR, and to improve the process properties of pressing, calendering, roll sticking and burning


Products: rubber tape, shock absorption rubber




[typical combination of rubber and plastic]




1. PVC and rubber blends:


Compared with NBR, NBR/PVC has improved strength, flame retardant, abrasion resistance, solvent resistance and ozone cracking resistance, and significantly improved processing performance and foaming performance of sponge.




PE and rubber blends:


Many kinds of rubber, such as PE and NR, have good mixing effect.




3. High styrene and rubber blends:


High styrene and rubber blend material of high strength, wear-resistant, easy processing, rolling, pressing semi-finished products surface smooth.




Ethylene propylene diene rubber/polypropylene (EPDM/PP)


Excellent weather resistance, ozone resistance, uv resistance and good high temperature resistance, impact resistance, oil and solvent resistance and general chloroprene rubber, can be used in common thermoplastic processing equipment for processing, has the advantages of simple processing, low cost, continuous production and recycling.